Move a bunch of code in content\common (as well as a few left in renderer) to the content namespace.

content/common/fileapi/webfilewriter_impl.cc

Index: content/common/fileapi/webfilewriter_impl.cc
===================================================================
--- content/common/fileapi/webfilewriter_impl.cc	(revision 163290)
+++ content/common/fileapi/webfilewriter_impl.cc	(working copy)
@@ -7,6 +7,7 @@
 #include "content/common/child_thread.h"
 #include "content/common/fileapi/file_system_dispatcher.h"
 
+namespace content {
 namespace {
 
 inline FileSystemDispatcher* GetFileSystemDispatcher() {
@@ -78,3 +79,5 @@
   GetFileSystemDispatcher()->Cancel(request_id_,
                                     new CallbackDispatcher(AsWeakPtr()));
 }
+
+}  // namespace content